Drill end sharpening means



DRILL END SHARPENING MEANS 5 Sheets-Sheet 1 Filed Jan. 28, 1949 4 il 1i H l 11; 1| T- Ea 5 m J g; 9 21 5? L1 3 INVENTOR. Edward C. Ka Jn/ck BYMQ Oct. 21, 1952 E. c. KAPNICK 2,614,370

DRILL END SHARPENING MEANS Filed Jan. 28, 1949 I5 Sheets-Sheet 2 INVENTOR. Edward C/Yapn/ck ATTORNEYS 06f. 21, 1952 E, Q KAPNlCK 2,614,370

I DRILL END SHARPENING MEANS Filed Jan. 28, 1949 3 Sheets-Sheet 3 Flcnfi. F1133.

Patented Oct. 21, 1952 UNITED STATES PATENT OFFICE DRILL END SHARPENING MEANS Edward C. Kapnick, Adrian, Mich. Application Janu'ary 28, 1949, Serial No. 73,240

Claims.

This invention relatesto tool grinding apparatusnand particularly to such apparatus adapted for grinding and sharpening drill ends.

.The primary object ofthe invention is the provision of a-simple and efficient holding means for 1 drills, which means is operable during a drill grinding or sharpening operation to impart a compound movement tothe drill end during uniform cutting edge onthe drill. Y

Other objects and advantages of the invention will be apparent from the following detailed lngs illustrating one embodiment of the invention,:in whicli- I I Fig. 1. is arside elevation of an apparatus embodying the invention, with a drill held description, and from the accompanying drawthereby in sharpening engagement with a grinding wheel, with parts broken away; Fig. 2 is an endelevation thereof, with parts brokenaway; Fig. 3 is a fragmentary sectional detail on the line 3-3 inFig; 1; Fig. 4 is an inner fragmentary side view of the drill-holder turning means for I imparting arcuate movements to the drill end;

Figs. 5 and 6 are sectionson the line 55 in Fig.

1, with the drillclamping means closed and open,

respectively, .and' with a portion of the former" broken away;.Figs. '7, 8 and 9 are diagrammatical views, showing the position of a drill relative to. the grindingv wheel ,in different stagesofiits movementsduri'ngg'a grinding operation; Fig. 10

is a sectlonon the line ill-l0 in Fig. 1, and Fig.

11 is a similar yiew..1with the clamping member thrown to, released position. i Referring tothe drawings, l designates the frame of a grinding machine with the grinding wheel 2thereof,in the present instance, mounted for rotatlonin a vertical plane and, having Tits outer side exposed for engagement therewith of the work to be ground... The frameyhas a ledgev or part 3 projecting horizontally from the sidethereof at which the grinding wheel is disposed and adistancebelowsaid wheel to supportzthe work holding and adjusting mechanism in which the features of the. presentinvention reside;- This mechanism comprises, in the present instance, a base; block 5' o'f'inverted'U-form in cross-sectioniwith its'legs resting on the top of the frame part 3,and;engaged by gibs B on said part to guide the block for sliding movements toward andaway from the frame. The top I of this block is of concaved arcuate formwith the are extending outward and upward from its inner end to define a rise from a horizontal of somewhatever Longitudinal,adjustment of the block 5 is eifected by turningv a cam .3 between the legs of a U-shaped cradle 9 that is mounted on'the frame part 3 between the legs of the block 5, in gibs m for free limited yielding movements between stops H, H. The cradle 9 is yieldingly urged in one direction by a spring I2 attached to the frame I and in the opposite direction by a spring l2 attached .to a screw I3. The spring [2 is somewhat the stronger of thetwoso as to normally hold the cradle 9 in engagement with the inner stop I l with respect to the cradle as to permit only a very limited movement of the cradle therebel5 at one. end. The. throw of the cam imparts a maximum movement to the block Bsubstan- The inward.

tially as indicated at'IBin Fig. 1. movement of the block is limited by an adjusting screw I] on the frame I.

l Adrill holding standard 20 is mounted on the arcuate top 1 of the baseblock 5 for adjustment lengthwise thereof whereby the tilt of the standard relative to the plane of the working. face of the grinding wheel 2 may be varied. A'idegree scaleon the side of the block indicates the angle of inclination. v v

The standard 20 comprises a base member 2| mounted on the arcuate top of thelbaseblocki for. adjustment lengthwise thereof, an intermediate member 22 mounted for transverse adjustment on the member 2|, and a top drill-:holding member 23 mounted for rotary adjustment on the member 22.

The base member 2| rests of the block 5 and in thepresent instance has opposing side plates 24 held to the member by suitable screws 24a and extending below the edgesof the member to have guiding engagement with the block 5,. and also extending above the top of the member. The member 2.2 is narrower than: the space between the side plates/2 1 and,

has" sliding dovetailed engagement with the between said plates.

The stops 1 I are so positioned on the arcuateztop I A tension rod 25 extends through a slot in the arcuate top of the block 5 and has its upper end in engagement with the offset portion of an eccentric shaft 21 mounted crosswise in the members 2| and 24. One end of the shaft is provided with a knob 28 to facilitate turning. A coiled expansion spring on the lower end of the rod 25 coacts with a nut or shoulder on the rod and with the under side of the arcuate top of the block 5 tozhold-the rod undertension when the shaft 2'1"is turned to the position shown in Fig. 3, whereby to exert a block-clamping tensionv on the rod. It is apparent that when the shaft is turned to place the eccentric portion in lowered position the block 2| can be freely shifted on the block 5 to place the former in desired position thereon to suit the tooledressing: angle;

The top member 23 rests on the top of the member 22 and has a stub shaft 30 fixedly'projecting therefrom into a bearing in the member 22,- with the shaft axis lengthwise of. the standard-' atlrightanglesto the'plane of relative ad-- justment of the members-2i and 22, as indicated by the dotted line a-in Fig.1; The shaft 30 intersects an opening 31 in the inner side-of the member'22 and within: this opening a cable 32. is wound oneor moretimes around the shaft and fixed thereto and its ends are extended laterallyin" opposite directions: from the shaft through registering openingsin the member 22 and anchoredftothe upperendsof the respective side plates 24,- as best'shown in Fig; 4.

It 'is apparent that movements of the member 22 in= opposite directions on the member 2| will caus'e the stationary cable 32-to turn the shaft 303and drill-holding member 23' in one direction or theother relative to the member 22.

Fixed to the upper' end ofthememb'er 23, in inclined relation to its rocking axis a, is a drillholding cradle'34. Thiscradle comprises abar 35: that is flxed at an inclineon theupper end surface of the member. 23= by a screw- 36, and is provided at its upper or front end with' anupstanding drill. rest 3Tiand rearwardly therefrom with.awlongitudinally adjustable drill rest 38. Eachofnthese rests is provided in itstop. with aIiEIIHdiVT-grOOVES 39 for receivinga drill 40. The d'rillkres't 38is provided at its rear end withan adjustable screw stop-41 for the drill andat its forward end with a hinged clamp frame 42'. This frame has a drill engaging jaw-l3 that. is inclined toih'avezcamming engagement with a drill when clamped .d'own thereon;v The jaw 43Jis' slidable lengthwiseinthe frame 42 and is urged toward th'e workby a spring' l l, the tension of which is adjustable bya screw 45.- The jaw 43 is also urged sidewise in the frame by a flatcorrugated springzinthe side 'of the' frame. The frame 42 is held in clamped position by a pin 46inserted into: registering: lapping. portions of the parts 38 and dz; The tool rest-38 is-held in adjusted positionon: the bar -35 byaconventional clampingsscrewmeans the screw shaft of which is operated by a handle 41.

Airont 'drillclamp'. 50 is attached to the for-- ward endiportionz'of the-bar. 35 adjacent to the front rest to cooperate-therewith to clamp the front end portion-sot the drill. This clamp com-.-

prisesfia. stem: 51 pivoted. at its lower end .for

Mounted. on" the, stem: 5l' for limited:

arm 53 projecting radially therefrom. The movements of the sleeve on the stem are guided by a pin 54 in the stem projecting into a longitudinally extending slot 55 in the sleeve. The lower end of the slot has a lateral extension to permit the sleeve and arm to be given a quarter turn on the stem when raised a distance against the tension of the spring 56 on the upper end of the stem. The arm 53 is adapted to swing over a clampedidrill 40 and is to .be-held in downwardly pressed engagement therewith. 'This arm has a spring-pressed finger 51 for engagement in a groove of the drill against a land thereof. This finger has .pin-and-slot connection with the arm and is yieldingly projected by a spring 58.

In an' operation of the device, a drill 4D, preparatory to being. ground, is placed in the rests 31, 38,with its forward end projected a desired distancefrom-the former for grinding by a proper adjustment of the stop .screw 4| which determines. the desired extent of'projectioniof theend of the'drill. beyond th'eiaxial linezas The clamp--- ing frame 42 is-then swungover in drill-holding.-

position. and: islheld in: such position by'the pin a 46.. The:.clamping.jaw d3 yieldsa-toadjust. itself to the diameter: of theydrilL. Theclamping arm. 53- is also: moved:- into positionitoengage over the: front end'portion of the drillin opposition'to. therest: 31' with thefinger :51 projectinginto a'...

The standard. base member 2| is.

now adjusted-on the arcuate-top ofjthe base block 5. tonplace the. lower-sidel of the-conical.v

drill groove;

cutting end of the drill 401para1lelto the outerside faceof thegrinding Wheel 2, sucli facing.

a being indicated: at b. The pressure of the drill.

end against the wheel is determined by the. tension of the spring. [2 acting-ton the block. Sand: through it and the cam 8 and-its shaft l4 ontlie base'block'5. The stop screw. l1 limits the extent of inward movement of the-block..5 and parts.

carried thereby relative :to; the. machine. frame. .I

After. a dressing of thefaceb'of the grinding."

wheel the screw I! may be adjusted'to'compene sate for the dressing or'the wheel 2. mayv be andv forward movement: of the; member 22 on the member 2| combined-with the rockingimovee ment. about the axisa,. which latter movement; is actuated by. movementof: the: shaft'alongit-he cable 32. Theimovementof the .drillend rela1- tive to t-hezwheelrfaceiis diagrammatically illustrated inl Figs. '7; .82 andv 9,-jwherein the line 0 indicates the length-of: transverse movement "of the-drill: endon the. wheel, on the-width. of that circular r grinding path .of. the. .WheelIfa'ce, and d indicates the rocking. axis. at thepointrof inter;-- section with the drill' axis. It is. apparent that;

the drill. end hasza" triple compound movementz (1) linear reciprocatorymovements of the point d :on the: line: GIJCOII'ESIJOIIdiHQ tO the linear "movement of themember 22 on the'member 2|: (2)

arcuaterr movement 0f.v the drill point about the I.

axial I pointed; and (3) the: arcuate rolling movementlof'the :conica'l endjsurf'ace of the drill; both movements (2) .and: (3) being occasioned bythe rocking: of :theimembersx23, 34, about the-shaft axis 'a:' This notaonly: effects a grinding of a pre-- determinedt'arc: of: th'exconical end surface of a drill, but J-also distributes: the grinding: over a relatively broad areazxof: the: wheel surface, thus preventing: the formation of; pits and groovesin the? wheelv surface and: obviating the necessity ground, the drill is rotatably shifted in the holder,

without removal therefrom, to bring successive arcs'into'gri'nding position and'the grinding action is repeated for each such adjustment of l the drill. I l

I wish-it understood that my-invention is not limited to any specific construction, arrangenient or form of the parts, 1 as it is capable of numerousmodifications and changes without de parting from the spirit of the claims. I Having thus described my invention, whatI claimas -new, and desire tosecure by United States Letters Patent, is:

1. In a drill grinding machine having a grinding wheel, means for holding a drill with its cutting end in engagement with the wheel and mounted for rocking movements about an axis intersecting the drill axis at a point adjacent and spaced rearwardly of the cutting end of the drill, means carrying said first means and operable to shift it transverse to said rocking axis and to the drill axis, means carrying said second-men' tioned means and guiding its transverse shifting movements, and means including a shaft on said first means and a connection between said shaft and third means operable to impart rocking movements to said first means when said second means is shifted.

2. The combination with a rotary grinding wheel, of means for holding a drill in end engagement with a grinding surface of the wheel, a mount carrying said means for rocking movements about an axis which intersects at an acute angle the axis of a drill held by said means with the point of intersection adjacent to the end of the drill to be ground. means supporting said mount for limited linear reciprocatory movements transverse to said rocking axis and parallel to the wheel surface engaged by the drill, and means including a shaft and cable connecting said mount and drill holding means and operated by reciprocatory movements of said mount to permit rocking movements to said first means,

the degree of rocking depending on the range of movement of the mount.

3. An apparatus for holding a drill with its cutting end in sharpening engagement with a grinding wheel, comprising a standard having a base, an intermediate member and a drill holder, said member being mounted on the base for predetermined shifting movements along a straight line relative thereto and said drill holder bein carried by said member for rocking movements about an axis which is perpendicular to said line of movement of the member and also intersects the axis of a drill carried by the holder, means including a shaft on said holder mounted in said member and a connection between the shaft and said base operable to rock said holder about its axis when the member is shifted on said base, whereby a compound movement is imparted to the end of the drill being ground.

4. An apparatus for holding a drill with its cutting end in sharpening engagement with a grinding wheel, comprising a base, a member mounted for reciprocatory movements on said base along a straight line, a drill holder mounted for rocking movements on said member with its rocking axis perpendicular to said line and intersecting the axis of a drill carried thereby with the drill axis inclined to the rocking axis, and

means connected to said holder and said base and actuated by reciprocatory movements of said member toimpart predetermined rckingmQve ments to the holder, whereby'a drill during grind;

ing has compound movements imparted thereto;

5. An apparatus for holding a drill with it's cutting end in sharpening engagement with'a grinding wheel, comprising a base, a member mounted for reciprocatory'movements'on' said base along a straight line parallel to the wheel grinding face engaged by'the arm, a drilljholder carried by said member and rockable about an axis perpendicular to said line and adapted to hold' a drill with its axis intersecting; at an acute anglesaid rocking axis adjacent to the] end of the drill to be ground, and means 'includ-" ing ,a shaft on said holder and a connection be-" tween said shaft and said base for rocking said holder when, said member is reciprocally moved on the base, wherebyc'ompound movements are imparted to the end of a drill being ground.

6. An apparatus as called for" by claim "5, wherein the drill axis is inclined to both said rocking axis and to the grinding face.

7, 'An apparatus for holding a drill With its cutting end in sharpening engagement with a rinding wheel,-comprising means forsupporting a drill in grinding relation to the wheel and including a base, means mounting said base for predetermined arcuate shifting movements in a plane transverse to the wheel grinding face, a member slidingly mounted on the base for movement along a straight line parallel to the axis of said arcuate movement and relative to the grinding face of the wheel, a drill holder mounted on said member for movements therewith and for rocking movements relative thereto about an axis perpendicular to said line, said drill holder having means for holding a drill with its cutting end in grinding position and with its axis intersecting said rocking axis adjacent to said cutting end, and means connecting said base and drill holder and automatically operable to rock said holder when said member and base are relatively shifted.

8. An apparatus for holding a drill with its cutting end in sharpening engagement with a I grinding wheel, comprising a drill holder for carrying a drill with its axis angular to a face supporting base in adjusted position on said of the grinding wheel and its cutting end in position to be ground, a standard carrying said holder, a supporting base mounting said standard for sliding movements along a' straight line parallel to the grinding face of the wheel, a subbase for said supporting base having an arcu ate face on which the supporting base is mounted for tilting adjustment in a plane transverse to the grinding wheel face, means holding said sub-base, said holder having a shaft fixed to said holder and rockable about an axis intersecting a drill axis adjacent to its carrying end, and means connecting said shaft and supporting base and operable by relative sliding movehaving a base, an intermediate member transversely shiftable on the base along a straight line, and a drill holder rockable on the intermediate member about an axis intersecting the drill ax-lslqadjacent, todts cutting -en dband nalsov perpendicular. to thelshifting line of the inter,- mediate member ar rocking,shaft vfixedly pro j eqti ng v from the VdrllLholder and jpurnaled in thesrintelfmediate.memben, and. a cable. wound 10;.- An, apparatus. as'lcalled fbri in c1aim 9,-to-

ggthernwithqan adjustable support. for the base. whereby thehstandardqmay be adjustedflrelative' to; a gz lx zdiilgev lheel.;

v EDWARD 'QVKA NICK REFERENCES CITED 1 The following V referencesare; of record rin the file of; patent:

UNITED STATES .PA'I'EN'I'S l.

Number? Number.

Name 7 Date Van; I-Iaagenz July 21,11,874" Walker "Oct; 1;;1889 I-I'a.1l v May--;9-,;;1893 Walker Ju1y;12, 18,9-8/ Aeppli Aug. 9, 19 32- Weishampel .Feb. 5,', 1935 Weishampel Nov; 9;:1937 -.Oorne=1l Nov; 15 1938 Satocking4 J an. -3; 1 939, ,Eich etial Sept; 7-, 1943- Z wi-ck; Nov.- 30,- 1943' Pelphrey; Apr. 18,.1944' Whipple Aug;26,1947 Hanford 7 Oct. 11451947 FOREIGN PATENTS 1 Country Date Great Britain my, 11.19.35? 

